【摘要】 岩体中含有大量节理，粗糙性作为岩石节理的主要特性之一，其对岩石爆破效果也有较大影响。为此，首先通过MATLAB软件编写节理粗糙度系数(JRC)计算程序，而后采用LS-DYNA软件建立含不同粗糙度节理的岩体爆破数值模型，研究其爆破破坏效应，最后以某地矿区岩体为研究对象，探究节理粗糙度对台阶爆破效果的影响，探究现有爆破参数的合理性。研究结果表明：节理迎波面反射和折射的应力波在节理迎波面的凹陷部分集中，该区域细小裂隙增多。随着节理粗糙度增加，应力波经过节理后的能量衰减加剧，节理对应力波的衰减效果增强，最终影响节理上部岩体的破坏，且其破坏程度弱于低粗糙度节理上部岩体。根据现场情况进行台阶爆破数值模拟，发现相同爆破参数作用下，节理粗糙性对台阶爆破效果有较大影响，当节理粗糙性较高时，大块率高，需要进一步优化爆破参数。当采用钻孔超深增加到1.2 m时，大块率显著降低，爆破效果明显改善。更多还原

【Abstract】 Rock mass contains a large number of joints, and roughness is one of the main characteristics of rock joints, which also has a significant impact on the blasting effect of rocks. To this end, a Joint Roughness Coefficient(JRC) calculation program was first developed using MATLAB software. Then, LS-DYNA software was used to establish a numerical model of rock mass blasting with joints of different roughness levels, and the blasting damage effect was studied. Finally, the rock mass in the Beskuduk mining area was taken as the research object to explore the influence of joint roughness on the step blasting effect and the rationality of existing blasting parameters. The research results indicate that the stress waves reflected and refracted from the upstream of the joint are concentrated in the concave part of the upstream of the joint, and there are more small cracks in this area. As the roughness of the joint increases, the energy attenuation of stress waves after passing through the joint intensifies, and the attenuation effect of stress waves corresponding to the joint increases, ultimately affecting the failure of the upper rock mass of the joint, and its degree of failure is weaker than that of the lower roughness joint upper rock mass. Based on the on-site situation, numerical simulation of step blasting was conducted, and it was found that under the same blasting parameters, the roughness of joints has a significant impact on the effect of step blasting. When the roughness of joints is high, the rate of large blocks is high, and further optimization of blasting parameters is needed. When the drilling depth is increased to 1.2 m, the block rate can be significantly reduced and the blasting effect can be significantly improved.更多还原